Lawn-mower sharpener



Oct. 28. 1924. 1,513,527

w. E. ARNOLD LAWN MOWER SHARPENER Filed July 28. 1923 2 Sheels-Sheet 1 Oct. 28. 1924.

W. E. ARNOLD LAWN MOWER SHARPENER 2 Sheng-'shea 2 Filed July 28. 1923 Patented Oct. Z8, 1924.

WILLIAM E. ARNOLD, OF OMAHA, NEBRASKA.

LAWN-Movies. snai-trannie.

Application filed July 28, 1923.

To all whom t may concern.'

Be it known that I, VILLIAM E. ARNOLD, a citizen of the United States, residing at Omaha, in the county of Douglas and State of Nebraska, have invented certain new and useful Improvements in Lawn-Mower Sharpeners; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The principal object of the present invention is the provision of a machine which admits of sharpening both the rotary cutter and the stationary cutter of a lawn-mower, the machine embodying means for automatically feeding the carriage holding the tool for sharpening the rotary cutter, and a grinding wheel for sharpening the stationary cutter, the operating part-s receiving inotion from a power-driven wheel adapted to be actuated by hand.

Other objects and advantages will be apparent and suggest themselves as the nature of the invention is understood.

While the drawings illustrate an embodiment of the invention, it is to be understood that in adapting the same to meet different conditions and requirements7 various changes in the form, proportion and minor details of construction may be resorted to without departing from the nature of the invention.

Referring to the accompanying drawings forming a part of the application:

F igure 1 is a front view of a lawn-mower sharpening machine embodying the invention, showing the rotary cutter of a lawn mower in position to be sharpened;

Fig. 2 is a top` plan view of the machine;

Fig. 3 is a vertical transverse section on the line 3-3 of Fig. 1;

Fig. 4 is a vertical transverse section on the line 4-4 of Fig. 1, looking to the left as designated by the arrows; and

Fig. 5 is a detail perspective view of the carriage for receiving the sharpening tool, and showing the parts intimately associated therewith.

Corresponding and like parts are referred to in the following description and designated in the several views of the drawings by like reference characters.

The frame of the machine for receiving the working parts embodies similar end standards 1 and 2, an upper connecting rod serial No. 654,391.

3 and spaced lower connecting rods 4. A

centering rod 5 is adjustably mounted in the end standard 1 and is adapted to be secured in the required adjusted position by means of a set screw 6. An arm 7 secured to the inner end of the centeringrod 5, is slidably mounted upon the upper connecting rod 3. A shaft 8 is mounted in the end standard 2 and is in line with the centering rod 5 and is provided at its outer end with a hand wheel 9 rotatable therewith. A sprocket wheel 10 is fast to the shaft 8 and is located intermediate the standard 2 and handwheel 9. A screw threaded shaft 11 disposed in-y termediate the connecting rods 4. is mounted in the end standards 1 and 2 and is provided at one end with a sprocket wheel 12 which is connected by means of a sprocket chain 13 with the sprocket wheel 10. In this manner the screw shaft 11 is rotated.

A carriage 14 is slidably mounted upon the connecting rods 4 and is pivoted to one of said rods to turn thereon, as indicated most clearly in Figure 5. The carriage 14 is provided with a half nut 15 which is adapted to coact with the screw shaft 11, whereby the carriage may be positively moved along the rods 4 which support the same. By pivotally mounting the carriage 14 upon one of the rods 4, it may beturned so as to disengage the half nut 15 from the screw shaft 11, so that the carriage may be quickly moved to any required position. A tool holder 16 is pivotally mounted upon the carriage 14 at 17 and is adjustable by means of a threaded rod 18 pivoted to the tool holder at 19 and passing looselythrough an opening formed in the carriage 14 and receiving a nut 20 which rests upon the carriage and when rotated operates to adjust the tool holder 16. The sharpening tool 21 is yadapted to be secured to the holder 16 in any1 preferred way and, as shown, consists of a e.

A grinding wheel 22is fast to the inner end of a shaft 23 which is mounted in the upper end of an arm 24 pivoted at its lower end to the standard 2 and adjustable by means of a brace 25. The outer end of the brace 25 loosely engages the outer end of the arm 24 and its inner end is threaded and receives a. thumbnut 26, whereby provision is had for adjusting the brace and the outer end of the pivoted arm 24. A friction pulley 27 fast to the outer end of the shaft 23 engages the hand wheel 9 and in this manner the grindingiwheel 22 is rotated, A rest 28 at the outer end of the arm and hav ing adjustable connection therewith, is provided to support the stationafrj;T cutter ot the lawn inower or other part to he sharpened.

A n arm 29 is fast to the inner end of the shaft 8 and is provided with dog,` 30 to engage the rotary cutter oi' the lawn inower to cause it to rotate with the shaft 8. The numeral 3l designates the rotary cutter oit a lawn mower, he same being supported between the centerline' rod 3 and thev sh rt o and causes to rotate with the latter hy means of the arm 29 and dop; SO. fr l ine carr age ill hearingl the sharpening` tool 2i, is anton` ti cally moved alongv the length or 'the rotarv cutter 3l hy means of the screw shaft li and half-nut i5. lnasinuch as the carriage travels upon the straight rods l which constitute a tract; therefor, the blades of the rotar7 cutter'tl are'sharpenec. to an edge coinciding with la cylindrical path. The stationary blade of thelawn-mower adapte;` to he sharpened by means of the grinding; wheel 22 and is supported upon the rest 28 during the sharpening'process.

What is claimed is:

1. In a lawn-mower sharpener, alined ineinloers Yfor 'supporting the rotary cutter of the motor, one of said members constituting the driver, a carriage, means on said carriage for adjustahly supporting` the sharpening tool, a track supporting` the carriage, a feed screw having connection with Athe said driver, and a iiialii--if1iitI on the carriage adapted to coact with said eed screw,

2., ln a lawn-mower Sharpener, supporting A'ineens for :the rot-ary cutter or" the mower, a carriage, means for moving the carriage, holder-1to1' the: sharpening v.-"tool 40 detachahly engage the other member, 'a feed 1 screw7 a half-nut on the carriage andv adapt- .il ed to coact with said feed screw, a holder ttor a sharpening' tool, and means :fidjustablgY connecting said holder with the carriage;

4. A lawn-mower Sharpener comprisin1 spaced end standards, sprftcedrods connect ingv the standards, a centering rod adjustably mounted in one of the standards, an arm at the inner end of the centering Vrod and slidingly engaging one'otY the"co-ime'cting` rods, a drive shaft mounted upon the' other standard in line with the centering rod and adapted to coact with the latterto' support f" the worli, a screw shaft lmounted uponthe' standard intermediate two other connecting; rods, a carriage mounted upon the--last-men tioned connecting rods and having pivotal connection with one of said rods and provided with a half-nut to coact with said 'screw shaft, a holder for a sharpening tool pivoted to said carriage, and means adjustabl-yconnecting said holder with the carriage.y

in testimony whereof l atlixmy signature in presence of two' witnesses. Y

WlLLlAM E;A ARNQLD. Witnesses z C. B. Sornnronnn, G. A, VVAsH. 

